Second man struck by Amtrak train

3:15 p.m. Update: Train 433 departing Baltimore at 3:30 p.m. has been canceled. The next train is Train 535 departing at 3:45 p.m.

1:50 p.m. Update: Amtrak has reopened two tracks following an accident in which an Acela Express train stuck and killed a person on the tracks about three miles south of the Baltimore-Washington International Thurgood Marshall Airport. Trains had been stopped, but are now moving through the area at reduced speeds.

1: 40 p.m. Update: Amtrak service from Union Station was shut down at 12:40 p.m. Thursday after an Acela Express train struck and killed a person on the tracks about three miles south of the Baltimore-Washington International Thurgood Marshall Airport station.

None of the 153 passengers aboard the train were injured, according to Amtrak. Officials are investigating the incident.

"It normally takes an hour or two hours to complete this kind of investigation. That's just an estimate," said Amtrak spokeswoman Karina Romero. "It's a pretty significant impact on trains," she said. She said that all the delayed trains would eventually depart.

1:30 p.m. Update: MARC reports that service has been restored on the Penn Line. Trains 424, 427, 429 and 520 will operate with delays of up to 30 to 45 minutes.

1:25 p.m. Update: MARC will hold Train 520 at Odenton. The agency reports that buses will transport passengers to all stops north of Odenton. Train 427 has been canceled.

1:20 p.m. Update: All MARC service on the Penn Line has been suspended until further notice, according to the Maryland Transit Administration.